Brace or bit-stock attachment.



N0. 63l,922. Patented Aug. 29, l899. I

' W. L. BAUM'GARDNER. BRACE 0R BIT STOCK ATTACHMENT.

(Application filed Jan. 5, 1899.)

2 Sheets-Sheet I.v

No Mudel.)

Patented Aug. 29,1899.

" No. 153L922.

w. BAUMGARDNER. BRACE 0R BIT STOCK ATTACHMENT.

(Application filed Jan. 6, 1899.)

(No Model.) 2 Sheets-Sheet 2. V

FIE- E .abbommp ms nonms rrzns co. PHOTO-LITHO. WASHINGTON. n. c.

P ca J 1 UNITED! STATES PATENT OFFICE.

WILLIAM L. BAUMGARDNER, OF WVATSONVILLE, CALIFORNIA.

BRACE OR BIT-STOCK ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 631,922, dated August29, 1899. Application filed January 5, 1899. Serial No. 701,217. (Nomodel.)

To all whom it may concern.-

Be it known that LWILLIAM L. BAUMGARD- NER, a citizen of the UnitedStates, residing at \Vatsonville, in the county of Santa Cruz and Stateof California, have invented certain new and useful Improvements inBrace or Bit- Stock Attachments; and I do declare the following to be afull, clear, and exact description of the invention,such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to attachments for braces or bit-stocks; andthejobject is to provide a device to be carried by the brace and whichis adapted to encompass the work and permit of the drill being fed asthe work progresses.

To this end the invention consists in the construction, combination, andarrangement of the device, as will be hereinafter more fully described,and particularly pointed out in the appended claims.

In the accompanying drawings the same reference characters indicate thesame parts of the device in the several views.

Figure 1 is a perspective View of my improved drill-chuck attachment forbreast braces as it would appear in use. Fig. 2 is a verticallongitudinal section. Fig. 3 is a longitudinal section through one ofthe transverse feed-shafts. Fig. 4 is a detail View of one of thespring-actuated pawls.

In the drawings, 1 denotes the chuck-spindle, the shank 2 of which isadapted to the ordinary brace and its lower end is provided with radialset-screws 3 3 to detachably secure the removable socket 4 in place.This socket is provided with the usual tapering rectangular orifice toreceive the correspondingly-formed shank of the ordinary drill or bit,and when this socket is removed the set-screws are used to secure theordinary straight-shank twist-drills.

5 denotes an annular collar formed integral with the spindle and whichforms a bearing for the series of balls 6, which also have a bearing inthe ball race 7, formed in the bracket 8, and which is held in place onthe chuck-spindle by means of the collar 9, secured thereon by theset-screws 10 10. The

outer ends of this bracket 8 terminate in in tcgral parallel flanges 12and 13, in which are journaled the transverse parallel feedshafts 14and15, on which are secured the drums 16 and 17, to which are fixed theouter ends of the coiled springs 18 18, the inner ends of which aresecured to the bolt 19, fixed in the outer ends of the crank-arms 2O 21,loosely mounted on said shafts between the drums.

The free end of the crank-arm 20 is provided with a strap or clevis 22,to which is fixed one end of the chain 23, the free end of which isadapted to encompass the Work and be adj ustably secured in a claw 24,pivoted in a strap or clevis 25, pivoted to the outer end of thecrank-arm 21, fixed on the feedshaft 15-.

The edges of the flanges 13 13 are serrated or formed withratchet-teeth, as shown, to engage the correspondingly-formed end of thespring-actuated pawls 26 26, fulcrumed on the hand-levers 27 27, fixedto the same ends of the feed-shafts.

In Fig. 4 I have shown one of the pawls 26 pivoted on the bolt 28, fixedin the hand-1ever 27. This bolt is encompassed by a spring 29, one endof which is fixed to the lever and the other end to the pawl, thetension of the spring being exerted to normally retain the inner end ofthe pawl in engagement with the serrated edge of the flange 13.

The operation of the device is as follows: The attachment is fitted to acarpenters ordinary brace, as shown in Fig. 1, a drill fitted to thechuck-spindle, and the chain passed around the work while there is notension on the springs, the hand-levers being in the position shown indotted lines in Fig. 2. The levers are then thrown upward to theposition shown in Fig. 1, which winds up or applies tension to thesprings, the tension being employed through the medium of the chain tohold the work against the drill, and as the drill is rotated by thebrace the spring-tension draws the work and drill together, and thusautomatically feeds the drill to the work without the necessity ofapplying pressure to the brace.

It will of course be understood that various changes in the form,proportion,and the minor details of construction may be resorted towithout departing from the spirit or sacrificing any of the advantagesof this invention.

Having thus described the in vention,what is claimed, and desired to besecured by Letters Patent, is

1. The chuck-spindle, the bracket mounted thereon, the spring-actuatedfeed-shafts journaled in said bracket, and the chain operativelyconnected to said shafts, substantially as shown and described.

2. The chuck-spindle, the bracket encompassing the spindle and formedwith the parallel flanges, the transverse parallel feedshafts journaledin said flanges, the hand-let vers and the drums fixed to said shafts,the crank-arms loosely mounted on said shafts, the springs having theirouter ends fixed t0 the drums and their inner ends fixed to thecrank-arms, and the chain connecting the

